MESON Chess Problem Database

Problem Display
PID: 18638 (8/3pNp1N/4P3/1K1pk1p1/1Bp3R1/2b2P2/Q3p3/4r3 w - - 0 1)

Ellerman, Arnoldo

1st Prize, Frankenthal Chess Club, 1957

8/3pNp1N/4P3/1K1pk1p1/1Bp3R1/2b2P2/Q3p3/4r3

#2

8 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Ra1
      • 2.Qxe2#
    • 1...Rb1
      • 2.Qxe2#
    • 1...Rc1
      • 2.Qxe2#
    • 1...Rd1
      • 2.Qxe2#
    • 1...Rf1
      • 2.Qxe2#
    • 1...Rg1
      • 2.Qxe2#
    • 1...Rh1
      • 2.Qxe2#
    • 1...d4
      • 2.Re4#
  • Tries
    • 1.Qc2?
      • threat
        • 2.Qf5#
      • 1...Kxe6
        • 2.Qf5#
      • 1...dxe6
        • 2.Sc6#
      • 1...fxe6
        • 2.Sg6#
      • 1...f5
        • 2.Qxf5#
      • 1...Bxb4!
    • 1.Qa6?
      • threat
        • 2.Qd6#
      • 1...d6
        • 2.Qxd6#
      • 1...Bxb4!
    • 1.Qa8?
      • threat
        • 2.Qxd5#
      • 1...Kxe6
        • 2.Qxd5#
      • 1...dxe6
        • 2.Qb8#
      • 1...fxe6
        • 2.Qh8#
      • 1...d4
        • 2.Re4#
        • 2.Qe4#
        • 2.Qd5#
      • 1...Rd1!
  • Keys
    • 1.Qxc4!
      • threat
        • 2.Qxd5#
      • 1...Kxe6
        • 2.Qxd5#
      • 1...dxc4
        • 2.Re4#
      • 1...dxe6
        • 2.Qc7#
      • 1...fxe6
        • 2.Rxg5#
      • 1...Rd1
        • 2.Qxe2#
      • 1...d4
        • 2.Re4#
        • 2.Qd5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 7
  • Sets
    • R(a);N_GUARD::QAR(A),XP(b)
    • R(a);N_GUARD,P_PINB(C)::QAR(A),XP(b)
    • P(e);N_GUARD::R1(D)
  • Tries
    • Try
      • Q(A);
      • Threat
        • QAR1(A)
      • Vars
        • K(f);P-FLIGHT,XP(F)::QAB1(A)
        • P(h);N_GUARD,SBLOCK,XP(F)::S(G)
        • P(i);N_GUARD,SBLOCK,XP(F)::S(G)
        • P(i);::QAR1(A),XP(i)
      • Refutation
        • B(c);XB(C)
    • Try
      • Q(A);
      • Threat
        • QAB1(A)
      • Vars
        • P(h);::QAB1(A),XP(h)
      • Refutation
        • B(c);XB(C)
    • Try
      • Q(A);
      • Threat
        • QAR1(A),XP(e)
      • Vars
        • K(f);P-FLIGHT,XP(F)::QAB1(A),XP(e)
        • P(h);N_GUARD,SBLOCK,XP(F)::QAB(A)
        • P(i);N_GUARD,SBLOCK,XP(F)::QAB(A)
      • Refutation
        • R(a);
  • Actual
    • Q(A);XP(d)
    • Threat
      • QAR1(A),XP(e)
    • Vars
      • K(f);P-FLIGHT,P_SPINP(e),XP(F)::QAB1(A),XP(e)
      • P(e);N_GUARD,XQ(A)::R1(D)
      • P(h);N_GUARD,SBLOCK,XP(F)::QAB(A)
      • P(i);N_GUARD,SBLOCK,XP(F)::R(D),XP(g)
      • R(a);N_GUARD::QAR(A),XP(b)
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